An image area of interest in an image file can be detected by a method with a relatively light processing load by making a determination using characteristics of a quantization table. Since spatial frequency information, chromaticity information, and a quantization table are acquired for respective predetermined...http://www.google.de/patents/US7356190?utm_source=gb-gplus-sharePatent US7356190 - Image area extraction method, image reconstruction method using the extraction result and apparatus thereof
